Why is the Safety Data Sheet (SDS) important in a laboratory setting?(1 point) Responses It provides entertainment for lab personnel during breaks. It provides entertainment for lab personnel during breaks. It lists the names of all personnel who have worked with a particular chemical. It lists the names of all personnel who have worked with a particular chemical. It serves as a record of experiments conducted in the lab. It serves as a record of experiments conducted in the lab. It contains detailed information on the properties, hazard, safe handling and emergency measures related to chemicals used in the lab. It contains detailed information on the properties, hazard, safe handling and emergency measures related to chemicals used in the lab. Question 13 Which of the following hypotheses is the best for this scenario? "In a high school science lab, a group of students is conducting an experiment to determine the amount of water needed to grow a seed into a fully mature plant. The students are investigating the effect of varying water amounts on the growth and development of bean plants."(1 point) Responses Bean plants will grow best when receiving a moderate amount of water, and excessive or insufficient water will result in stunted growth or plant mortality. Bean plants will grow best when receiving a moderate amount of water, and excessive or insufficient water will result in stunted growth or plant mortality. The amount of water has no effect on the growth and development of bean plants; all plants will grow equally well regardless of the water amount. The amount of water has no effect on the growth and development of bean plants; all plants will grow equally well regardless of the water amount. Bean plants will grow best when they receive the least amount of water, as this will encourage them to develop deeper roots and seek out water. Bean plants will grow best when they receive the least amount of water, as this will encourage them to develop deeper roots and seek out water. Bean plants will grow best when they receive the most amount of water, as this will provide them with more nutrients and encourage faster growth. Bean plants will grow best when they receive the most amount of water, as this will provide them with more nutrients and encourage faster growth. Question 14 A team of scientists at a research laboratory is conducting a study on the effects of different concentrations of a drug on bacterial growth. They need to accurately measure and prepare precise concentrations of the drug solution for their experiments. Which of the following tools will be needed?(1 point) Responses A water bath A water bath A thermometer A thermometer A digital balance A digital balance A data collection probe A data collection probe Question 15 In a scientific experiment, what is the dependent variable?(1 point) Responses The factor that remains unaffected by other variables in the experiment. The factor that remains unaffected by other variables in the experiment. The factor that is deliberately changed or manipulated by the research to observe its effect. The factor that is deliberately changed or manipulated by the research to observe its effect. The factor that is kept constant throughout the experiment. The factor that is kept constant throughout the experiment. The factor that is measured or observed to obtain results. The factor that is measured or observed to obtain results. Question 16 In a scientific experiment, what is the independent variable?(1 point) Responses The factor that is measured or observed to determine the effect of the independent variable. The factor that is measured or observed to determine the effect of the independent variable. The factor that remains unaffected by other variables in the experiment. The factor that remains unaffected by other variables in the experiment. The factor that is deliberately changed or manipulated by the researcher. The factor that is deliberately changed or manipulated by the researcher. The factor that is kept constant throughout the experiment. The factor that is kept constant throughout the experiment. Question 17 What is the difference between the following 2 statements? Statement A: The finches on the Galapagos Islands, which have different beak shapes adapted to their specific diets, exemplify how species can evolve distinct traits in response to their environment. Statement B: The gravitational attraction between the Earth and an apple, which causes the apple to fall from a tree to the ground, is expressed by Sir Isaac Newton's description of the gravitational force between two objects. (1 point) Responses Statement A is a theory and Statement B is a law. Statement A is a theory and Statement B is a law. Both statements are scientific theories. Both statements are scientific theories. Statement A is a law and Statement B is a theory. Statement A is a law and Statement B is a theory. Both statements are scientific laws. Both statements are scientific laws. Question 18 What evidence would have been needed to contradict the theory of gravity before it was proven to be a law?(1 point) Responses Consistent measurements showing that the gravitational constant varies significantly on Earth. Consistent measurements showing that the gravitational constant varies significantly on Earth. Observations of objects floating upwards without any external force. Observations of objects floating upwards without any external force. Discovery of a force stronger than gravity that acts universally on all matter. Discovery of a force stronger than gravity that acts universally on all matter. Experiments demonstrating that objects of different masses fall at different rates in a vacuum. Experiments demonstrating that objects of different masses fall at different rates in a vacuum. Question 19 What part of the scientific method is most likely to lead to changes in a theory?(1 point) Responses Methods Methods Results Results Problem Problem Hypothesis

Answer 1

Here are the correct answers for each of your questions:

Question 12: Why is the Safety Data Sheet (SDS) important in a laboratory setting?

• Correct Response: It contains detailed information on the properties, hazard, safe handling and emergency measures related to chemicals used in the lab.

Question 13: Which of the following hypotheses is the best for this scenario?

• Correct Response: Bean plants will grow best when receiving a moderate amount of water, and excessive or insufficient water will result in stunted growth or plant mortality.

Question 14: Which of the following tools will be needed to prepare precise concentrations of the drug solution?

• Correct Response: A digital balance.

Question 15: In a scientific experiment, what is the dependent variable?

• Correct Response: The factor that is measured or observed to obtain results.

Question 16: In a scientific experiment, what is the independent variable?

• Correct Response: The factor that is deliberately changed or manipulated by the researcher.

Question 17: What is the difference between the following two statements?

• Correct Response: Statement A is a theory and Statement B is a law.

Question 18: What evidence would have been needed to contradict the theory of gravity before it was proven to be a law?

• Correct Response: Observations of objects floating upwards without any external force.

Question 19: What part of the scientific method is most likely to lead to changes in a theory?

• Correct Response: Results.

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